JP5728262B2 - Disc type steam trap - Google Patents

Description

The present invention relates to a disk-type steam trap that automatically discharges condensate generated in a steam piping system by opening and closing a valve disk in response to a pressure change in a variable pressure chamber, that is, a thermodynamic steam chamber, and in particular, bimetal. It relates to the one that can be used to eliminate air binding.

The disc-type steam trap automatically controls the condensate by opening and closing the valve disc that is separated from the valve seat surface consisting of the inner and outer ring valve seats by the pressure change in the variable pressure chamber formed behind the valve disc. Are exhausted. In this case, even if air flows in at the time of starting, it closes instantaneously as in the case of steam, and once closed, air does not cause a condensing action unlike steam, so it cannot be opened thereafter. So-called air binding occurs. Therefore, conventionally, this air binding has been eliminated by using bimetal. This utilizes the bending action caused by the temperature change of the bimetal, so that the valve disk is forcibly lifted and opened at low temperatures so as not to interfere with the valve disk at high temperatures. An example of this is shown in Patent Document 1. This is because an end ringed bimetal ring is disposed on a conical slope formed on the outer periphery of the outer ring valve seat, and an intervening ring is disposed between the valve disk and the bimetal ring. The air binding is eliminated by cooperation with the expansion / contraction action. That is, the bimetal ring moves up along the slope at low temperatures, lifts the valve disc via the intervening ring and opens the valve from the inner and outer ring valve seats, and moves down along the slope at high temperatures. No interference with the valve disc.

Japanese Patent Publication No. 50-8809

In the above conventional disc type steam trap, when the air binding is eliminated, the upper outer side of the outer ring valve seat is closed by the valve disc and the intervening ring, so that foreign matter such as dust and scale reaching the upper part of the outer ring valve seat is removed. Since it accumulates between the outer ring valve seat and the valve disk and then gets caught between the outer ring valve seat and the valve disk when the valve disk is closed, there is a problem that the valve cannot be completely closed and steam leakage occurs. In addition, since the valve disk cannot be lifted unless the bimetal ring exhibits a large operating force, there is a problem that the bimetal ring is easily worn and the air binding cannot be eliminated relatively early.

Therefore, the problem to be solved by the present invention is to prevent foreign matter from accumulating between the outer ring valve seat and the valve disk, and to lift the valve disk with a small operating force of the bimetal ring so as to eliminate air binding. It is.

In order to solve the above-mentioned problems, the disc type steam trap of the present invention has a conical slope formed on the outer periphery of the outer ring valve seat by arranging a valve disk in a variable pressure chamber formed by the inner and outer ring valve seats and the lid member. Ended bimetallic ring is arranged at the end, and an intervening ring with the upper end formed obliquely between the valve disc and the bimetallic ring is arranged, and the bimetallic ring expands and contracts due to the slope and temperature change The air binding is eliminated by separating the valve disk from the inner and outer ring valve seats via the intervening ring at a low temperature in cooperation with.

According to the present invention, the air binding is canceled by the bimetal ring moving up along the inclined surface portion at a low temperature and lifting the valve disk via the intervening ring to open the valve from the inner and outer ring valve seats. . At this time, since the foreign matter between the outer ring valve seat and the valve disk flows out to the outside of the outer ring valve seat through the end portion of the intervening ring, an excellent effect that it does not accumulate above the outer ring valve seat is produced. In addition, since the valve disc is swung up with one point on the uppermost end side of the intervening ring as a point of action of the force, the valve disc can be lifted with a small operating force of the bimetal ring, and air binding can be eliminated. Produces an effect.

It is sectional drawing of the disk type steam trap concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. An inlet 2 and an outlet 3 are formed on the same axis on the main body 1, and a variable pressure chamber 4 communicating with the inlet 2 and the outlet 3 is formed by the lid member 5 and the main body 1. An inner ring valve seat 6 and an outer ring valve seat 7 are formed concentrically and in the same plane at the opening ends of the inlet 2 and the outlet 3 on the variable pressure chamber 4 side, and an annular groove 8 is formed therebetween. A disc-shaped valve disk 11 that is attached to and detached from the inner and outer ring valve seats 6 and 7 is disposed in the variable pressure chamber 4. The inlet 2 and the variable pressure chamber 4 communicate with each other via an inlet passage 9 formed in the inner ring valve seat 6, and the variable pressure chamber 4 and the outlet 3 communicate with each other via an outlet passage 10 formed from a part of the annular groove 8.

On the outer periphery of the outer ring valve seat 7, a conical slope portion 12 and an upper plane portion 15 and a lower plane portion 16 are formed on the upper end portion and the lower end portion of the slope portion 12, respectively, and the end bimetal ring 13 is disposed. Between the bimetal ring 13 and the valve disk 11, an interposed ring 14 having an end and an oblique upper surface is disposed. At a low temperature, the bimetal ring 13 contracts and moves up the inclined surface portion 12, and the valve disk 11 is swung and lifted with one point on the uppermost end side of the interstitial ring 14 acting as a force acting point, and the inner and outer ring valve seats 6, 7. The seat is opened from the upper side and is placed on the upper plane portion 15. Since the valve disk 11 is swung up and lifted, air binding can be eliminated with a small operating force of the bimetal ring 13. Further, the foreign matter between the outer ring valve seat 7 and the valve disc 11 flows away to the outside of the outer ring valve seat 7 through the end portion of the intervening ring 14.

The operation of the above embodiment will be described. When the trap body is at a low temperature, the bimetal ring 13 is shrunk as shown in FIG. Open the valve and discharge low-temperature condensate and air.

If the high-temperature condensate flows, the bimetal ring 13 expands and moves down the slope portion 14 and rests on the lower plane portion 16, and is not involved in the valve disk 9. In this way, air binding is eliminated. Thereafter, steam is not escaped based on the well-known operation principle of the disc type steam trap, and only condensate is automatically discharged.

The present invention can be used for a disk-type steam trap that automatically discharges condensate generated in a steam piping system.

DESCRIPTION OF SYMBOLS 1 Main body 2 Inlet 3 Outlet 4 Transformer chamber 5 Cover member 6 Inner ring valve seat 7 Outer ring valve seat 8 Annular groove 9 Inlet passage 10 Outlet passage 11 Valve disk 12 Slope part 13 Bimetal ring 14 Interposing ring 15 Upper plane part 16 Lower plane part

Claims (1)

A valve disk is arranged in a variable pressure chamber formed by the inner and outer ring valve seats and the lid member, and a bimetal ring with ends is arranged on a conical slope formed on the outer periphery of the outer ring valve seat. An intervening ring with an end and an upper surface formed obliquely with a notch in the circumference between them is arranged, and at low temperatures by cooperation with the slope and the expansion and contraction action of the bimetal ring due to temperature change A disc type steam trap characterized in that air binding is eliminated by separating the valve disc from the inner and outer ring valve seats via an intervening ring.

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